The Birthplace of Gamma-Ray Bursts: Abundance Gradients and Constraints on Progenitors | Zendy

E. RamirezRuiz | Zendy; Davide Lazzati | Zendy; A. W. Blain | Zendy

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The Birthplace of Gamma-Ray Bursts: Abundance Gradients and Constraints on Progenitors

Author(s) -

E. RamirezRuiz,

Davide Lazzati,

A. W. Blain

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339018

Subject(s) - gamma ray burst , astrophysics , physics , stars , metallicity , galaxy , isotropy , luminosity , astronomy , quantum mechanics

The physics of gamma-ray bursts (GRBs) and their offsets from the centers oftheir host galaxies are used to investigate the evolutionary state of theirprogenitors, motivated by the popular idea that GRBs are linked with thecataclysmic collapse of massive stars. We suggest that GRB progenitors in theinner and outer regions of hosts may be intrinsically different: outer burstsappear to have systematically greater isotropic equivalent energies (ornarrower jets). This may provide an interesting clue to the nature of GRBs, andcould reflect a relation between metallicity and the evolution of GRBprogenitors. If true, then this offset-isotropic luminosity correlation is astrong argument for a collapsar origin of long-duration GRBs.Comment: 10 pages, 1 figure, accepted for publication in ApJ Letter

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